49 results about "Cellobiose" patented technology

The invention discloses a cellobiose 2-epimerase mutant as well as a gene, an expression vector, recombinant bacteria, a preparation method and application thereof. The mutant is obtained by performing the following point mutation on an amino acid sequence as shown in SEQ ID No.1: S12A, S24A, G131A, G176A, G224A, K46R, K69R, K72R, K91R, K103R, K201R, K219R, K223R, K241R, K263R, K266R, K273R, K284R, K325R, K335R, K349R and K387R. The invention further discloses a preparation method of the mutant. The invention further discloses a gene segment, a plasmid and a recombinant bacterium for recombinant expression of the mutant, and the gene segment, the plasmid and the recombinant bacterium are used for recombinant expression preparation of the mutant. The mutant can be used for continuously and stably catalyzing and preparing lactulose at high temperature, is relatively good in thermal stability and has a relatively good industrial application prospect.

The invention discloses heat-resistant alpha-glucan phosphorylase and application thereof in synthesis of amylose with different molecular weights, and belongs to the field of genetic engineering and modern enzyme technology engineering. The alpha-glucan phosphorylase derived from the Dictyoglomus. Sp.NZ13RE01, provided by the invention, has a relatively high optimum temperature and excellent thermal stability, and can be used for preparing the alpha-glucan phosphorylase from the Dictyoglomus. Sp.NZ13RE01. When the alpha-glucan phosphorylase is used for synthesizing amylose, the alpha-glucan phosphorylase from the source can be used for synthesizing amylose with different molecular weights under the condition of cellobiose / G4 primers in different proportions, and under the condition that the proportion of cellobiose / maltotetraose primers is 1: 4, the excellent conversion rate is 34.52%, the yield is 17.26 g / L, and the yield is 17.26 g / L. The average molecular weight is 5040 + / -26.75 g / moL, so that the method is suitable for producing amylose in a small molecular weight range, and therefore, the method has a good application prospect in an artificially synthesized starch system.

In the present application, by knocking out the BG gene in Trichoderma reesei PX3 (a strain of cellulase transcription activator that can be activated continuously), the BG activity can be reduced under the condition of not reducing or even increasing the filter paper enzyme activity of the enzyme system, and a low BG enzyme activity and high filter paper enzyme activity strain is constructed. This strategy can avoid the negative impact on cellulase production after BG knockout, and the obtained strain can be used for efficient production of cellobiose or as a chassis strain for producing cellulase.

The invention discloses a flexible glass cutting fluid and a preparation method thereof, and the preparation method comprises the following steps: S1, adding cellobiose into DMF, then adding chloroacetic anhydride and pyridine, and carrying out a stirring reaction to obtain an intermediate; s2, adding the intermediate into DMF (Dimethyl Formamide), and then carrying out constant-temperature reaction on glycerol monocaprylate, 2-(2-hydroxyphenyl) benzothiazole and triethylamine to obtain a modifier; s3, uniformly mixing a modifier, sodium dioctyl sulfosuccinate and a polyoxyethylene polyoxypropylene block copolymer, so as to obtain a composite surfactant; s4, adding the composite surfactant, the propylene glycol, the defoaming agent, the sterilizing agent and the triethanolamine into the water, and uniformly stirring to obtain the cleaning agent. According to the prepared cutting fluid, the protection effect on a flexible glass base material and a surface functional layer of the flexible glass base material is remarkably improved while the excellent wettability is kept, microcrack generation and surface damage in the cutting process are reduced, and the cutting fluid is particularly suitable for precise glass processing of flexible display devices.

The present application relates to a kind of insecticidal compositions containing flonicamid and celangulin, wherein the weight percentage of effective component flonicamid and celangulin is 1-80:10-0.1, which can be further preferred as 10-60:5-0.1.The total mass of two effective components flonicamid and celangulin accounts for 1%-90% of the mass of the entire preparation, which can be further preferred as 10-60%, and the rest is the common adjuvant or filler in pesticides.The insecticidal composition of the present application can be prepared into suspension concentrate, water dispersible granules, water emulsion, microemulsion, emulsifiable concentrate and wettable powder and other dosage forms.The present application carries out binary compounding of flonicamid and celangulin, has obvious synergistic effect, and the quick-acting and long-acting properties of pesticide are good, and reduces production cost and use cost, and is especially suitable for the prevention and treatment of thrips.

The present invention relates to a pig immune-enhancing feed containing natural plant extracts, belonging to the technical field of feeds. On the basis of the basic components, the feed of the present invention also adds a composite extract of plantain and selfheal, a composite extract of purslane and sweet potato vine leaves, and eucommia leaf extract. The composite extract of plantain and selfheal is obtained by successively fermenting the whole plant of plantain and the whole plant of selfheal with Lactobacillus cellobiosus and Pediococcus acidilactici, and then successively subjecting them to enzymatic hydrolysis with trypsin and nattokinase step by step; the composite extract of purslane and sweet potato vine leaves is obtained by successively fermenting the whole plant of purslane and sweet potato vine leaves with Lactobacillus cellobiosus and Bacteroides ruminicola, and then successively subjecting them to enzymatic hydrolysis with snail protease and trypsin step by step; the eucommia leaf extract is obtained by successively subjecting eucommia leaves to enzymatic hydrolysis with hemicellulase, bromelain, and nattokinase step by step. The extract contains immune-enhancing active ingredients, and when used in combination with the basic feed, it can enhance the immunity of pigs, effectively reduce diarrhea, and reduce the risk of disease.

The application provides a kind of complex hydrolytic enzyme and its preparation method, it is related to enzyme engineering technical field.The preparation method includes: aspergillus niger is inoculated in culture medium to carry out fermentation, and the fermentation liquor containing beta-glucosidase is collected;The fermentation liquor is subjected to solid-liquid separation to obtain beta-glucosidase preparation;Add alpha-L-arabinofuranosidase and cellobiohydrolase to obtain the complex hydrolytic enzyme.This technology uses specific content of sodium carboxymethyl cellulose and wheat bran to synergistically ferment, the activity and specificity of the main enzyme beta-glucosidase are greatly improved by nutritional induction and conformation simulation;Subsequently, alpha-L-arabinofuranosidase and cellobiohydrolase are compounded, the single enzyme limitation is broken and the feedback inhibition is removed, and the overall catalytic efficiency and conversion rate are significantly improved.

The application belongs to the technical field of traditional Chinese medicine, and particularly relates to a traditional Chinese medicine composition and a preparation method and application thereof, active ingredients of the traditional Chinese medicine composition including a fermentation product prepared by subjecting traditional Chinese medicine raw materials to anaerobic solid-state fermentation in combination with Lactobacillus helveticus and enzyme preparation; the traditional Chinese medicine raw materials include ginseng, poria cocos, Chinese yam, white lentil, lotus seed, yiyi seed, amomum villosum, platycodon grandiflorum, licorice and dried tangerine or orange peel; and the enzyme preparation includes cellulase and / or cellobiase. The application effectively promotes dissolution of effective ingredients of Shenlingbaizhu powder, significantly enriches antioxidant active ingredients in the fermentation product, relieves inhibition of oxidative stress on immune cells, and greatly improves survival rate and phagocytic efficacy of macrophages, so that the application shows a significant antibacterial pneumonia effect and has an excellent application prospect.

To provide alternative and / or improved sweetness modifying composition.SOLUTION: There is provided a sweetness modifying composition comprising: one or more high-intensity sweetener(s) selected from steviol glycosides and / or mogrosides; and one or more low-intensity sweetener(s) selected from cellobiose, psicose, cyclamate and / or 11-O-mogroside V, wherein the sweetness modifying composition increases the sweetness of a sweetened composition by more than the sweetness of the sweetness modifying composition alone; and / or wherein the ratio of the one or more high-intensity sweetener(s) to the one or more low-potency sweetener(s) ranges from about 2:1 to about 12:1.SELECTED DRAWING: None

The invention discloses a disaccharide monosubstituted derivative of Lamellarin D and N. The structure of the disaccharide monosubstituted derivative is as follows: R1 and R2 are respectively and independently selected from one of H, methyl, benzyl, acetyl and disaccharide, R3 is selected from H, benzyl or disaccharide, R4 is selected from H, methylsulfonyl or disaccharide, and at least one of R1-R4 is disaccharide; the disaccharide group is one of cellobiose group, acetylated cellobiose group, lactosyl group, acetylated lactosyl group, maltose group and acetylated maltose group. According to the present invention, at least one disaccharide group is introduced into R1-R4 to obtain the disaccharide mono-substituted derivative of Lamellarin D and N, the proliferation inhibition activity of tumor cells is improved with the compound and the monosaccharide substituted derivative, and the inhibition effect on non-solid tumor cell line Jurkat is significantly improved by about 5 times;

The invention provides a multienzyme system for preparing cellobiose as well as a preparation method and application of cellobiose, and belongs to the technical field of bioengineering. The multi-enzyme system disclosed by the invention is prepared from endoglucanase, cellobiose hydrolase and lysed polysaccharide monooxygenase, wherein the endoglucanase is EG5C-1m, the cellobiose hydrolase is TeCel7A T393K, and the lysed polysaccharide monooxygenase is LsAA9A. According to the method disclosed by the invention, a multi-enzyme system for accurately degrading cellulose into cellobiose is constructed by screening high-efficiency endoglucanase, cellobiose hydrolase and lysed polysaccharide monooxygenase. On the basis, the optimal reaction condition of a multi-enzyme system is determined, a method is provided for efficient generation of cellobiose from cellulose, and a basis is provided for subsequent biomass conversion of high-value products.

Solutions and methods are disclosed for the extraction and quantification of cellulose derived from cellulosic biomass samples. Improved extraction yields and selectivities are provided through the use of an extraction solvent mixture comprising an aprotic solvent such as DMSO, a quaternary ammonium salt such as TBAF, and an quaternary ammonium base such as TBAOH. The extracted cellulose can be optionally precipitated using disclosed precipitation solutions to further improve cellulose purity. Extracted cellulose can be measured by hydrolyzing the cellulose to glucose or cellobiose, or by using disclosed spectrophotometric assays of cellulose-salt complexes.

The application relates to a method for preparing natural gas by taking biomass and polyhydroxy compounds as raw materials. The method comprises the following steps: mixing the raw materials with water and a catalyst, and carrying out a reduction reaction in a reducing atmosphere to obtain a product containing natural gas; the raw materials are selected from biomass raw materials or / and polyhydroxy compounds; the biomass raw materials are selected from at least one of beech sawdust, poplar sawdust, pine sawdust, birch sawdust, wheat straw or corn straw; the polyhydroxy compounds are selected from at least one of cellulose, hemicellulose, cellobiose, xylose, guaiacol, sorbitol, isosorbide, glycerol, erythritol, xylitol or glucose; the catalyst comprises a carrier and an active component loaded on the surface of the carrier; the active component is selected from metal elements; the metal elements are selected from at least one of the single elements of ruthenium, rhodium, platinum, palladium or iridium. The method provides a path for converting biomass such as sawdust and polyhydroxy compounds to prepare natural gas, and has important industrial application prospects.

The invention discloses a method for preparing indole by catalyzing carbohydrates, which comprises the following steps: adding carbohydrates, water, aniline and a catalyst into a closed container, and carrying out high-temperature reaction in a hydrogen reducing atmosphere at the pressure range of 2-8MPa and the temperature range of 150-300 DEG C to obtain a mixed solution containing indole, the carbohydrate is any one or a combination of at least two of cellulose, cellobiose, glucose, fructose, starch and cane sugar. Therefore, by utilizing the characteristics that the catalyst exerts different catalytic activities in different components in the heterogeneous solvent, the heterogeneous solvent regulates and controls a reaction path, a high-activity silicon source in silicon dioxide and the like, mutual promotion or synergy between an intermediate product and the solvent, effects between double metals and effects between the metal and the silicon source are realized; therefore, the purpose that the catalyst catalyzes carbohydrates to generate indole in the solvent environment of water and aniline is achieved, and a new conversion way is provided for converting the carbohydrates into the indole.

The following methods enhance the sweetness of sugars: A sugar or a sugar-containing sweetening composition is blended with at least one selected from the group consisting of oligosaccharides and megalosaccharides, in which two or more fructose molecules are bonded to glucose, in a proportion that does not exhibit sweetness. The sugar is at least one selected from the group consisting of sucrose, maltose, glucose, fructose, trehalose, and cellobiose.

The invention belongs to the technical field of aquatic feed protein sources, and particularly relates to a method for increasing the protein content of DDGS (Distillers Dried Grains with Soluble). The method comprises the following steps: carrying out enzymolysis on corn DDGS by adopting hydrolase, and then carrying out enzyme inactivation, centrifugal separation and drying to obtain corn DDGS concentrated protein; the hydrolase is prepared from one or more of cellulase, xylanase, beta-glucolase, beta-glucosidase and cellobiase. According to the method, the protein content is increased through enzymolysis, and possible adverse effects of microorganisms used in a traditional method for increasing the DDGS protein content through microbial fermentation and metabolites of the microorganisms on the health of aquatic animals can be avoided. Meanwhile, the mycotoxin content of the DDGS can be reduced, and the vomitoxin content of the DDGS is further reduced from 2mg / kg to a degree which cannot be detected.

The present invention relates to the use of cellobiofructose (CBF) as a dietary fiber and / or prebiotic component in food products, food product additives, nutraceuticals and / or beverages or for increasing the growth of probiotic microorganisms. The invention further relates to CBF and compositions containing it for use in the prevention and / or treatment of obesity, constipation, high cholesterol, diabetes, hypertension, and / or heart disease. The invention further encompasses a method for the (recombinant) production of cellobiofructose (CBF), as described herein, using a polypeptide having levansucrase activity which comprises or consists of a polypeptide having at least 80 % sequence identity to the amino acid sequence set forth in SEQ ID NO: 1.

A process to hydrolyze cellulose into cellobiose comprising the following steps: - providing a reaction vessel; - providing a Cellulomonas uda (ATCC 491) inoculum; - exposing said Cellulomonas uda (ATCC 491) bacterium to a source of cellulose having a kappa number of less thanin an aqueous medium of pH of about 8 at a temperature ranging from 30 °C to 35 °C for a period of time ranging from 14 to 42 days; - exposing the cellobiose to a bacterium or fungi or yeast, or combination which converts cellobiose to glucose or ethanol.

The invention relates to a preparation method of an icaritin double-cellobiose derivative in the field of medicine and chemical synthesis, which comprises the following steps: icaritin I and bromoacetyl cellobiose II are put into a solvent, and are catalyzed by an inorganic base and a phase transfer catalyst to react to obtain an icaritin double-cellobiose derivative III, and the reaction route is shown in the specification. When the icaritin double-cellobiose derivative III is prepared, icaritin and bromoacetyl cellobiose which are easy to obtain are used as starting raw materials, the price is low, the chemical catalysis process is simple, the reaction condition is mild, the reaction yield is high (36%-76%), and industrial production is easy.

This method for producing hydrogen gas comprises a step for obtaining hydrogen gas by irradiating a mixture containing a substrate containing at least one substance selected from the group consisting of chitin, cellulose, hemicellulose, lignin, glucose, cellobiose, starch, and alcohol and a catalyst containing a base metal component with light, the mixture containing a substrate containing at least one substance selected from the group consisting of chitin, cellulose, hemicellulose, lignin, glucose, cellobiose, starch, and alcohol.

The invention relates to the technical field of biology, in particular to a zymomonas mobilis recombinant strain for producing ethanol by taking cellobiose as a raw material and application of the zymomonas mobilis recombinant strain. On the basis of recombinant zymomonas mobilis expressing beta-glucosidase, an efficient cellobiose conversion system is constructed through the synergistic effect of promoter and signal peptide optimization and gene multi-copy regulation, the activity of extracellular beta-glucosidase is remarkably improved, cellobiose is accelerated to be hydrolyzed into glucose, and the activity of beta-glucosidase is improved. The yield of ethanol is promoted to be obviously improved. Based on the fact that no linear positive correlation exists between the activity of beta-glucosidase and the yield of ethanol, the bottleneck of cellulose degradation under high substrate concentration is solved through multi-element coordinated regulation and dynamic matching of enzyme activity and substrate metabolism, and the energy efficiency and industrial application value of biomass energy conversion are remarkably improved.

This invention belongs to the field of microbial technology, and discloses a highly efficient anaerobic fungal strain for degrading lignocellulose in the rumen of Dulong cattle, its cultivation method, and its applications. The strain is *Neisseria gonorrhoeae*. Joblinomyces apicalis DLM2, deposited at the China Center for Type Culture Collection (CCTCC) under accession number CCTCC NO: M 20252927, was isolated from the rumen of Dulong cattle and can be stably cultured under strictly anaerobic conditions. This strain possesses a single-centered cell line and filamentous rhizoids, enabling it to efficiently degrade lignocellulose through a synergistic effect of physical colonization and enzymatic degradation. It exhibits broad adaptability to natural straws such as rice straw and bamboo branches, as well as purified substrates such as microcrystalline cellulose and cellobiose. Its enzyme production exhibits substrate-inducible properties, and fermentation produces various metabolites including formic acid, acetic acid, and ethanol, demonstrating high lignocellulose degradation efficiency. This invention relates to an inoculum containing this strain and its application in lignocellulose degradation, roughage fermentation, agricultural straw resource utilization, and biomass conversion, providing new strain resources and technical support for the efficient degradation and resource utilization of lignocellulose.

This invention discloses a reagent kit and method for the joint detection of glucose, cellobiose, and xylose in cellulose hydrolysate, belonging to the field of biomass conversion and analytical detection technology. The method includes the following steps: setting up three types of detection channels: a glucose oxidase detection channel that specifically responds to the glucose component; a β-glucosidase-glucose oxidase combined detection channel that responds to the total signal of glucose and cellobiose; and a pyranose oxidase detection channel that simultaneously responds to the combined signals of glucose, cellobiose, and xylose. Enzymatic colorimetric reactions are performed on the cellulose hydrolysate sample and the multi-component gradient standard solution in the three types of detection channels, respectively. A ternary linear calibration model is constructed based on the absorbance data of the three types of channels of the multi-component gradient standard solution. This method provides a rapid, low-cost, and highly specific detection method for glucose, cellobiose, and xylose in cellulose biomass hydrolysate, and has practical application value.

Provided are a southern corn leaf blight-resistant Thph2 protein from Trichoderma harzianum, a ZmGLP1-17 protein from Zea mays L., and a method for preparing transgenic Zea mays L. Further provided are a cellobiohydrolase protein Thph2 from Trichoderma harzianum T30, a coding gene for the cellobiohydrolase protein, and use of the cellobiohydrolase protein in inducing a response of a GLP ZmGLP1-17 from Zea mays L. against southern corn leaf blight. Trichoderma harzianum strain OEthph2 overexpressing a Thph2 gene is constructed by a transgenic technique. OEthph2 may induce the expression of the GLP ZmGLP1-17 in roots of Zea mays L. and enhance the resistance of leaves of Zea mays L. to the infection of Cochliobolus heterostrophus. ZmGLP1-17 transgenic Zea mays L. material is constructed. The OEthph2 engineered strain may be combined with the ZmGLP1-17 transgenic Zea mays L. material to synergistically improve a control effect for southern corn leaf blight.

The present invention discloses a Vibrio vulnificus selective culture medium and a preparation method thereof. The culture medium comprises a basal culture medium and additives; the basal culture medium comprises peptone, beef extract powder, sodium chloride, potassium chloride, a long-chain alkyl sulfate anionic surfactant or nisin, D-cellobiose, an acid-base indicator, and agar; the additive is tellurite; and the solvent is water. When the basal culture medium contains nisin, the additives further comprise vancomycin, amphotericin B, and polymyxin E. The Vibrio vulnificus selective culture medium of the present invention has high growth selectivity, effectively inhibits the growth of Gram-positive bacteria, effectively inhibits fungal growth, and is sensitive and specific for detecting Vibrio vulnificus. Furthermore, the preparation method does not require autoclaving and avoids the inconvenience of preparing the high-content component, cellobiose, into a sterile additive prior to use, making it more convenient.

The invention discloses candida maltose and application of the candida maltose in production of feed protein. The selected candida maltose is a wild strain separated from wood rotten substances, and has the capacity of rapidly metabolizing monosaccharide / disaccharide such as glucose, xylose and cellobiose and accumulating microbial protein. The saccharomycetes can be co-cultured and fermented with trichoderma reesei and aspergillus niger, and lignocellulose agricultural wastes such as corncobs and the like are used as raw materials to produce feed protein through one-step fermentation. The invention provides an excellent strain and an effective method which can be used for producing feed protein, and has wide application value in the field of microbial protein.

The application discloses a method for preparing high-value cellobiose from a medicine and food homologous Radix Millettiae and application of the high-value cellobiose. The method comprises the following steps: extracting cellulose from Radix Millettiae; optimizing a beta-glucanase enzymolysis process by using a response surface method; after the enzymolysis liquid is subjected to selective removal of glucose through yeast fermentation, the high-value cellobiose product is obtained through acetone precipitation and freeze-drying. The process condition is mild and environment-friendly, high-value utilization of agricultural waste is realized, the obtained cellobiose product has high purity, and an economic and effective approach is provided for large-scale production of cellobiose. Animal experiments prove that the cellobiose product has a significant relieving effect on colonitis induced by dextran sulfate sodium in mice, can effectively improve disease symptoms, reduce oxidative stress, repair intestinal barrier and regulate inflammatory response, and has a good application prospect in preparation of functional food or medicine for relieving colonitis and high-value utilization of Radix Millettiae.

According to the method, firstly, high-proportion bamboo powder is used as a carbon source, and by means of comprehensive regulation and control of bamboo flavones, cellobiose synthesized through fermentation and the like in the bamboo powder, cellulase producing genes and the like of bamboo-decomposing bacteria are induced and activated, so that the bamboo-decomposing bacteria are obtained; meanwhile, the cultivation environment, self-space hybridization, fusion, seed liquid, an enzymolysis agent, a permeation stabilizer, strain enrichment and the like of the bamboo degradation strains are regulated and controlled, and combined bacteria such as bacillus subtilis, aspergillus oryzae, lactic acid bacteria, saccharomycetes, rhizopus and the like are prepared; then the bamboo decomposition combined bacteria synergistically and interactively efficiently degrade nitrogen source bamboo fibers in directional fermentation under substrate optimization and multi-dimensional comprehensive regulation and control conditions, the nitrogen source bamboo fibers are converted and synthesized into high-quality mycoprotein, digestible bamboo protein, soluble sugar and other nutrient substances, the repression effect in the bamboo decomposition fermentation process is eliminated, and the bamboo decomposition effect is improved. The problems of low fermentation strain activity, low adaptability, low efficiency, poor synergy, biological safety, stability and the like are solved.

The present invention relates to the use of monoester glycolipids or mixtures of monoester glycolipids in laundry detergent compositions. The monoester glycolipids or mixtures of monoester glycolipids include a carbohydrate fraction selected from the group consisting of maltose, cellobiose, trehalose, isomaltulose, lactulose, isomaltose and mixtures thereof.

The invention discloses a radix sophorae flavescentis composite traditional Chinese medicine preparation for reducing soft-shell eggs and sand-preserved eggs of laying hens as well as a preparation method and application thereof, and relates to the technical field of traditional Chinese medicine preparations. The radix sophorae flavescentis composite traditional Chinese medicine preparation is prepared by mixing radix sophorae flavescentis, radix astragali, herba epimedii, herba leonuri, pine needles, chestnut shells and licorice roots to serve as a traditional Chinese medicine composition, adopting lactobacillus plantarum, lactobacillus cellobiosus and bacillus lentus as fermentation bacteria liquid, inoculating the traditional Chinese medicine composition with the composite fermentation bacteria liquid, and conducting fermentation, drying and smashing. Through cooperation of the traditional Chinese medicine composition and the zymophyte liquid, the production of soft-shell eggs and sand-preserved eggs can be reduced. In addition, the lactobacillus plantarum, the lactobacillus cellobiosus and the bacillus lentus are combined to serve as the zymophyte liquid, and the zymophyte liquid has a synergistic effect on reducing soft-shell eggs and sand-preserved eggs laid by the laying hens.